<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      let str = "5, 2, 1, -10, 8";
      const arr = str.split(",");
      arr.sort((a, b) => {
        return b - a;
      });
      console.log(arr.join(",")); // 8, 5, 2, 1, -10
    </script>
  </body>
</html>
